my 86 hatch won't start when the temp is below 45 deg f or so. i tried wiring the fuel pump from a switched source the fuel pump ran but no start. today the ambient temp was > 50 deg and it started right up. just for fun i checked the original wires to the fuel pump and it had power (with engine running) wtf?

Next time it won't start I would check the float bowl to make sure the fuel is actually getting to the carburetor. If it is getting fuel I would hook up a load tester to the battery when it is cold. My battery was acting weird below 40 degrees and finally died when the temps hit 25, so it was off to Wal-Mart for a new battery.